Rear foot GEL Cushioning System: Attenuates shock during impact phase and allows for a smooth transition to instance.nSeamless Construction: The use of seamless materials reduces the potential for irritation and friction caused by traditional stitches and seams.nPerforated Sock liner: Optimizes moisture drainage and improves breathability.nMagic Sole Outsole: Vented midsole and outsole minimizes weight and maximizes breathability.nThe GEL-Hyper speed 7 shoe features a perforated sock liner to optimize moisture drainage, allowing your feet to stay dry. The guidance line technology delivers an even smoother transition in between strides. It’s versatility in both speed-training and during races makes the GEL-Hyper speed 7 shoe an ideal choice for athletes.